On one hand I doubt many characters have enough cantrips to require an entire "separate panel", but on the other hand I would also love to see them grouped separately from the rest of the spells for increased visual clarity.
It depends for me. If Larian improves how hotbar works, then no I don't need - I will want cantrips assigned to hotbar as they are free to use, and therefore I will be most likely to use them most often - however, as hotbar still requires maintenance as spells add themselves without my permission, in places I don't want them a cantrip selection would allow me to ignore hotbar entirely for spellcasters.
